Recording meter pen



Nov. 28, 1939. H. C. KOFKE RECORDING METER PEN Filed June 26, 1936 Patented Nov. 28, 1939 UNITED STATES PATENT OFFICE RECORDING METER PEN Application June 26,

3 Claims.

My invention relates to the type of fountain pens employed with recording charts; such pens being carried by temperature or pressure influenced members and being designed to trace upon a moving surface a record of the movement of such members which movement is correlated to indicia or markings upon such moving surface.

One object of my invention is to provide a simple and efiicient structure designed to effect lo fine line marking.

A further object of my invention is to provide a pen that Will make marking contact of the ink carried thereby the moment it engages the moving record surface.

And a further object of my invention is to provide a pen of the type described with a downwardly curved and sharply channeled writing tip end that will effect fine line marking.

These and other features of my invention are more fully described hereinafter; reference being had to the accompanying drawing, in which:

Figure 1 is an enlarged perspective view of a recording meter fountain pen within the scope of my invention; such view also illustrating one manner of mounting a, pen of this type upon a pressure or temperature influenced member.

Fig. 2 is a perspective view of a similar pen illustrating a modified detail of construction.

Fig. 3 is a plan View of my improved fountain pen on a greatly enlarged scale.

Fig. 4 is an enlarged view looking toward the marking end of the pen, and

Fig. 5 is an enlarged sectional view of the marking tip end of the pen, showing one position it may occupy with respect to a moving surface upon which a record is being traced.

Pens of the type to which my invention has been applied are quite small and it will be understood that the views of the drawing are greatly exaggerated in order that the features of my invention may be fully disclosed.

The feature of my invention is the provision of a fountain pen of the character described capable of making an extremely fine line. This is effected by providing the pen with a sharp downwardly curved writing or marking tip end that is channeled to its extremity so as to be capable of direct engagement with the moving record surface and present the marking fluid at the moment of contact.

The pen proper may be of conventional type as indicated at I0, being generally V-shape in cross section, with inturned shoulders H at its rear portion and forwardly tapered wall portions l2 1936, Serial No. 87,421

terminating in a sharp writing or marking tip end which is downwardly curved as indicated at 13.

A fragmentary portion of one form of carrier for the pen, which is part of a temperature or pressure influenced member, is indicated at 5 M and usually has a curved resilient portion I 5 from which a pen-engaging clamp It depends; such clamp being usually positioned at the rear of the pen.

The V-shape of the pen provides a sharply 10 defined channel in a single plane throughout the major portion of its length and this channel extends to and into the downwardly curved end [3, as clearly indicated in Figs. 3 and i, so that at the extremity of such downwardly curved end this fine channel serves to convey by capillary attraction to the moving record surface an extremely fine stream of ink which results in the production of a fine line upon the moving surface of a chart such as indicated at H.

By reason of the downwardly curved writing or marking end of the pen into which the V- shaped channel extends in generally diminishing extent to its end, and the manner in which such channeled end may be presented or applied to the record surface, I am able to bring directly to such surface the end of this channel at the fine point of the pen and as a result the ink delivers to such moving surface at the instant of contact and eifects fine line marking as the record surface moves.

The pen may be open throughout its entire length, or it may have an end wall, as indicated at Ill Fig. 2, which may be integral with one of the side walls.

The fountain pen may be supported in a position slightly inclined in either direction with respect to the moving surface receiving its markings; one inclination being indicated in Fig. 5, or it may be horizontally disposed with respect thereto. When positioned so that the ink tends to flow toward the moving surface, an openended pen such as illustrated in Figs. 1 and 4, may be employed. When positioned as indicated in Fig. 5, a pen having a rear wall such as shown in Fig. 2, is preferably employed.

I do not wish to be limited to the application of my invention to fountain pens of the V-type since the downwardly curved, sharply channeled marking end may be supplied to pens of other cross section so long as there is a sharp channel, which may be V-shape, adjacent to the downwardly curved marking end and extending to the extremity of the same for direct contact or engagement with the moving record surface.

neled to its extremity for direct presentation of ink to a vertically disposed moving record surface.

3. A fountain pen made of thin sheet metal of V-shape for use with recording meters; said pen having a sharp end terminating in a downwardly extending curve and channeled to its extremity for direct presentation of ink to a vertically disposed moving record surface.

HARRY C. KOFKE. 

